class Battery1:
    def __init__(self, battery_size=70):
        self.battery_size = battery_size

    def describe_battery(self):
        print(f"This Battery is {self.battery_size}.")

class ElectricCCar1:
    def __init__(self, battery, car):
        self.battery = battery
        self.car = car
        self.battery = Battery1()